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When do you see the blotches when the negative is in solution B? Right away or do they appear gradually?

Also, is the blotchiness generally in one direction, or random. Looking at the botches in Walter's negatives they appear to be in the direction of the rotation of the drum. Anything in your case that could be associated with agitation in Solution A, or in how Solution A was drained?

Re: Divided Procat HD

Sandy and Ken
I use a 5 min presoak in the drum. I have run this test 3 times and 3 times the blotches
appear in the same area of the film in the sky. I ran the test without sky in the exposure and could not see any blotches.

Re: Divided Procat HD

If the blotches are appearing during development in Solution B my hunch is that they the reason is due to the mechanism of draining of Solution A. If that is so the blotches probably begin immediately as soon as the negative goes into Solution B. I am really interested to hear what Ken has to say about this since he has the infrared device and can observe the progress of development.